All Cylinders. All the time.

The Range AFM/DFM Disabler allows your V6 or V8 GM vehicle to run in full cylinder mode at all times, preventing the Active and Dynamic Fuel Management systems from dropping cylinders. Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. Full power delivery all the time without factory warranty concerns. CARB testing process in progress!

Full Power

  • No more shuddering as your engine cycles between running on half or all cylinders
  • Improved power at light throttle with all cylinders firing which can actually result in improved fuel economy depending on your driving habits
  • GM's troublesome valve lifters will no longer be tasked with activating and deactivating constantly, saving you money on costly future repairs

The Range AFM/DFM Disabler is the ultimate solution for full time V8 mode.

Fast and Easy Setup

  • No tools needed
  • Simply remove it if uninstallation is necessary
  • No mechanical ability is needed, if you can plug something into the wall in your home, you can install and uninstall this without issue

Simply plug the module into your OBD-II port and it instantly disables the AFM or DFM system


  • When the roads are covered in snow, you'll have the power to charge through and make it home
  • If your travels take you off the beaten path, you'll have the power to emerge on the other side unscathed
  • When hauling heavy loads, you need all the power you can get

The power and control you need in any situation

Safe and Reversible

  • Leaves no trace after uninstallation; your warranty is safe with Range
  • Simply unplug it to return to factory settings
  • If you're trading your trusty GM vehicle in on a newer model that's also equipped with AFM or DFM, take your module with you and plug it into your new vehicle

Our AFM/DFM disabler does not reprogram the factory ECU

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    AFM/DFM Disabler

    The Range AFM & DFM (Active/Dynamic Fuel Management) Disabler makes sure you have 100% of your power on tap at all times with no delay. It also reduces wear on costly engine components.